Method TrayIcon():onBeforeMenuPopup() Foundation

A event handler which is called automatically just before a popup menu is displayed. The :onBeforeMenuPopup() handler can be overridden to implement custom behavior in a user-defined class derived from TrayIcon. In particular, the handler can be used to populate the default popup menu with items, or to synchronize the state of existing menu items with the internal state of the application. The following code snippet shows how a "Quit" menu item can be added to the default popup menu.

// Add a "Quit" menu item to the default popup menu the first 
// time the menu is opened. 
METHOD MyTrayIcon:onBeforeMenuPopup( oMenu ) 
  IF oMenu:numItems() > 0 
     // Menu is already populated. Ignore. 
     RETURN self 
  ENDIF 

  oMenu:addItem( {"Quit",, PostAppEvent(xbeP_Quit,,,)} ) 
RETURN self 

Note that the popup menu is not displayed if it does not contain any items.